Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f75e2428b221b7a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 02:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e05c67b94124bf088aaf29cc4183c5b4 SHA-1: 5a9f6aee5adf81191d9ab30d39e7efea483bf554 SHA-256: 1f75e2428b221b7ac6f9f66f9ae26551abaecfdd1a0b60bb39072fc82c1c12a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on potentially disposable domains. This suggests a phishing or malware distribution scheme, where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://htbestcomputer.com/media/ftp/file/98529417744.pdf In PDF document text
    • http://ip-malkov.ru/uploads/files/fivegonajijigag.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092500545545433.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/4854807297.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/16636151606.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/66779215209.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/70089243225.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/monavofezef.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901192418.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/rosoberazodoxisi.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/81074890784.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/dufinodilugemuduge.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/81139687753.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/wonojolupuxibodanex.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493029c6391---gigotazotujuru.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/xukilonolosafino.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/59369671749.pdfIn PDF document text
    • http://offerparts.com/upload/files/55688513108.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dae7d26771---15733581698.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/47079481721.pdfIn PDF document text
    • https://carlojans.com/cms/file/jajonigu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/tinetilomugas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=robert+greene+48+laws+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 15996 bytes
SHA-256: 45a65a87c7054883faecd636ddeb5c8167ac28820874a08f42f735c6105245f6
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 11136 bytes
SHA-256: 89f9c6c4da6d8b2ecca0bb17065a3ea2648eb3dba20e6aed922470a38e12f96f

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